Summary information |
|
|---|---|
Default value |
0 |
Range of values |
0 – 127 |
Status |
Static |
Display level |
Comprehensive |
Required role |
System administrator |
Configuration group |
Processors |
(Process mode only) max online Q engines specifies the maximum number of Q engines you can have online, and is required for MQ (see the Active Messaging documentation).
The maximum number of Q engines depends on the value of max online engines:
max online Q engines cannot be greater than max online engines minus number of engines at startup. That is, if the value for max online engines is 57, and the value for number of engines at startup is 28, the value for max online Q engines cannot be greater than 29.
Setting max online Q engines reserves the high range of max online engines for Q engines. Once you set max online Q engines, Adaptive Server engines can no longer use the engines in the range that is reserved for Q engines. For example, if you set max online engines to 10 and set max online Q engines to 4:
Adaptive Server issues an error if you attempt to bind an engine group to engines 6, 7, 8, or 9
You cannot change the value of number of engines at startup to 7, 8, or 9
You cannot add engines 6, 7, 8, or 9 to an engine group
Because setting max online Q engines may affect existing production environments, Sybase recommends that you increase the value of max online engines by the same amount that you increase max online Q engines. For example, if you increase max online Q engines by 4, also increase max online engines by 4.
